#VU25510 Heap-based buffer overflow in QEMU - CVE-2020-1711

Vulnerability identifier: #VU25510

Vulnerability risk: Medium

CVSSv4.0: 2.4 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-1711

CWE-ID: CWE-122

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
QEMU
Client/Desktop applications / Virtualization software

Vendor: QEMU

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to a boundary error in the way the iSCSI Block driver handles a response coming from an iSCSI server while checking the status of a Logical Address Block (LBA) in an "iscsi_co_block_status()" routine. A remote authenticated attacker can trigger heap-based buffer overflow and cause a denial of service condition or potentially execute arbitrary code with privileges of the QEMU process on the host.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

QEMU: 2.12.0 - 4.2.0

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External links
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1711
https://lists.gnu.org/archive/html/qemu-devel/2020-01/msg05535.html
https://www.openwall.com/lists/oss-security/2020/01/23/3

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.